> ## Documentation Index
> Fetch the complete documentation index at: https://private-7c7dfe99-mintlify-8c05c8a2.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

> Table système contenant des informations sur les modifications des paramètres dans les versions antérieures de ClickHouse.

# system.settings_changes

<div id="description">
  ## Description
</div>

Contient des informations sur les changements de paramètres dans les versions antérieures de ClickHouse.

<div id="columns">
  ## Colonnes
</div>

* `type` ([Enum8('Session' = 0, 'MergeTree' = 1)](/fr/reference/data-types/index)) — Le groupe de paramètres (Session, MergeTree...)
* `version` ([String](/fr/reference/data-types/index)) — La version du serveur ClickHouse.
* `changes` ([Array(Tuple(name String, previous\_value String, new\_value String, reason String))](/fr/reference/data-types/index)) — La liste des modifications apportées aux paramètres qui ont modifié le comportement de ClickHouse.

<div id="example">
  ## Exemple
</div>

```sql theme={null}
SELECT *
FROM system.settings_changes
WHERE version = '23.5'
FORMAT Vertical
```

```text theme={null}
Row 1:
──────
type:    Core
version: 23.5
changes: [('input_format_parquet_preserve_order','1','0','Allow Parquet reader to reorder rows for better parallelism.'),('parallelize_output_from_storages','0','1','Allow parallelism when executing queries that read from file/url/s3/etc. This may reorder rows.'),('use_with_fill_by_sorting_prefix','0','1','Columns preceding WITH FILL columns in ORDER BY clause form sorting prefix. Rows with different values in sorting prefix are filled independently'),('output_format_parquet_compliant_nested_types','0','1','Change an internal field name in output Parquet file schema.')]
```

<div id="see-also">
  ## Voir aussi
</div>

* [Paramètres](/fr/reference/system-tables/overview#system-tables-introduction)
* [system.settings](/fr/reference/system-tables/settings)